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+//page 98

+//Example 3.19

+clc;

+clear;

+close;

+function [tr] = trace_matrix(M,n)

+    for i = 1 : n

+    tr = tr + M(i,i);

+    end

+endfunction

+n = round(rand() * 10 + 2);

+disp(n,'n = ');

+A = round(rand(n,n) * 10);

+disp(A,'A = ');

+tr = 0;

+disp('Trace of A:');

+tr1 = trace_matrix(A,n);

+disp(tr1,'tr(A) = ');

+disp('--------------------------------');

+c = round(rand() * 10 + 2);

+disp(c,'c = ');

+B = round(rand(n,n) * 10);

+disp(B,'B = ');

+disp('Trace of B:');

+tr2 = trace_matrix(B,n);

+disp(tr2,'tr(B) = ');

+disp(c*tr1+tr2,'tr(cA + B) = ');

+//end